Improvement in millstone-dressers



UNITED STATES PATENT OFFICE.

J. E. KARELsEN, or NEW YORK, N. Y.

IMPROVEMENT IN lVIlLLSTONE-DRESSERS.

Specification forming part of Letters Patent No. 36,716, dated October:21, 1862.

To all` `whom it may concern.-

Be it known that I, J. E. KARELsEN, ofthe city, county, and State of NewYork, have in vented certain new and useful Improvements inMillstone-.Dressersg and I do hereby declare that the following isafull, clear, and ex'- act description of the same, reference being hadtothe accompanying drawings, forming a part of this specification, inwhich- Figure l represents a plan 4or top view of my invention. Fig. 2is a transverse vertical section of the same'. Y

Similar letters of reference in both views indicate corresponding parts.

This invention consists in the arrangement of a V'shaped guide attachedto the front edge of the hinged adjustable rule of a millstonedress, incombination with a V-shaped lug attached to the edge of thediamond-holder in such a manner that the point of the diamond isprevented falling down into the holes or cavities which inevitably occurin the surface of millstones, and that lines of equal depth can be drawnwith ease. and facility.

It consists, also, in the application to said rule of one or moreserrated spring-catches in such a manner that the operator is preventedfrom moving the diamond across the surface of the stone in the wrongdirection.

It consists, finally, in the arrangement of an adjustable spring slidein combination with the diamond and its holder in such a manner that thepower with which the diamond bears down upon the stone can be regulated,and that said pressure when regulated remains uniform until changed bythe operator.

To enable' those skilled in the art to fully understand my invention, Iwill proceed to describe its construction and operation with referenceto the drawings.

A represents a flat plate or'bed, of cast-iron or any other suitablematerial, which is provided with three grooves or cavities, a a b.

, The grooves a c extend in a transverse direction clear across theplate A, and they form the guides for the bars'B B, to the `front endsdirection of the arrows marked thereon in Fig. l, when they are leftfree to act, or if their action is not opposed.

The central groove, b, in the plate A forms the guide for the slide D,which is fastened to the rule C by a hinge, e, or by any other suitablemeans. This slide is furnished on one edge with cogsf, meshing into apinion, g, that rotates on a pivot, h. To this pinion motion is impartedby an arm, E, which turns on the pivot lr, and to which a pawl, i, ispivoted that gears into a ratchet-wheel, F, attached to said pinion. Thepawl fi is so arranged that by throwing the arm E in the direction ofthe arrow marked near it in Fig. 1 the. ratchetwheel and pinion arerotated, and in going back said pawl slides over the teeth of theratchet-wheel, the latter being prevented from turning in the oppositedirection by a second pawl, j. A spring, 7c, throws the arm E in thedirection opposite to the arrow marked on the same, and its motion inthis direction vis limited by a stop, k', which is adjustable by `orAmore serrated spring-bars, G, which are hinged to the upper surface oi'the rule, prevent the diamond being moved in the wrong direction, theybeing so arranged that they willV open if the diamond-holder is moved'in the direction of the arrow marked upon itin Fig'. 1; but if it isattempted to start the-holder in the opposite direction the serratedbars retain it and prevent its motion.

The diamond-holder H is provided with a Vshaped groove, m, fitting inthe projection Z of the rule, and the diamond itself is secured in ahead, n, which connects by a rod, o, with a slide, p, ,being fastened inthe same by means of a setscrew, q, so that it (the rod) is free to moveup and down between certain limits. A spring, r, placed between theslide and head, forces the latter, together with the diamond, down, anda set-screw, s, which bears upon the end of the slide p, allows ofadjusting the same up or down, as may be desired. By means of the springr the power with which the diamond bears down upon the stone is rendereduniform, and this power can be regulated by adjusting the slidep up ordown by means of the set-screws s.

If the diamond is once adjusted it produces lines of uniform depth, andthe diamond is prevented being broken by pressing it down on the stoneWith undue pressure, and if it is,

desired to produce deeper or shallower lines the set-screw s is turneddown or up, and thereby the diamond is made to bear on the surface ofthe stone with greater or less power.

By the use of the hinges c c e between the rule C and plate A, I amenabled t0 Work With the diamond in the interior of the grooves of amillstone, and if the grooves are curved a rule of corresponding shapeis inserted, and the dressing can be accomplished with the greatest easeand facility.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The arrangement of the V-shaped projection Z at the front edge of therule C, in combination With a corresponding groove, m, on thediamond-holder H, constructed and op; erating substantially as and forthe purpose shown and described.

2. The application to the rule C of one or more serrated spring-bars G,substantially as and for the purpose specified.

3. The arrangement of the adjustable slide p and spring r, incombination with the head n, containing the diamond, and with thesetscrews q and s, and V-shaped groove m, all constructed and operatingas and for the purpose described.

4. Connecting the rule C to the plate A by means of hinges c c e, ortheir equivalents, substantially as and for the purpose described.

J. E. KARELSEYN.

